Thyristors and Tranducers - General Questions (2)

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Thyristors and Tranducers - General Questions

9. 

What type of application would use a photovoltaic cell?
A. an automobile horn
B. a TI 92 calculator
C. a magnetic field detector
D. a remote power source

Answer: Option D

Explanation:

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10. 

What is an SCR?
A. a PNPN thyristor with 3 terminals
B. a PNPN thyristor with 4 terminals
C. a PNP thyristor with 3 terminals
D. an NPN thyristor with 3 terminals

Answer: Option A

Explanation:

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11. 

The only way to close an SCR is with:
A. a trigger input applied to the gate
B. forward breakover voltage
C. low-current dropout
D. valley voltage

Answer: Option A

Explanation:

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12. 

A UJT has:
A. two base leads
B. one emitter lead
C. two emitter leads and one base lead
D. one emitter lead and two base leads

Answer: Option D

Explanation:

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13. 

Which is the DIAC?
A. mca14_10012a1
B. mca14_10012b1
C. mca14_10012c1
D. mca14_10012d1

Answer: Option A

Explanation:

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14. 

What does a hall effect sensor sense?
A. temperature
B. moisture
C. magnetic fields
D. pressure

Answer: Option C

Explanation:

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15. 

When checking a good SCR or TRIAC with an ohmmeter it will:
A. show high resistance in both directions
B. show low resistance with positive on anode and negative on cathode, and high resistance when reversed
C. show high resistance with negative on anode and positive on cathode, and low resistance when reversed
D. show low resistance in both directions

Answer: Option A

Explanation:

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16. 

A TRIAC:
A. can trigger only on positive gate voltages
B. can trigger only on negative gate voltages
C. cannot be triggered with gate voltages
D. can be triggered by either a positive or a negative gate voltage

Answer: Option D

Explanation:

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